Director John Cassavetes and Producer Stanley Kramer had many creative/economic differences and during the editing phase, Cassavetes was fired.
Although the British Board of Film Censors passed the film with an "X" certificate on 15 February 1963, United Artists took over three years to release the film in the UK. It finally premiered at the London Pavilion on 14 July 1966 and ran two weeks. In spite of two major stars and The Times headline "film worth waiting four years for," the UK release was small and not always handled appropriately. In St Ives, Cornwall, it was booked for two days in December 1966 and shared the bill with St George and the 7 Curses.
"A Child is Waiting" apparently went over budget by $500,000, which would have been the equivalent of Burt Lancaster's salary.
Twenty children from the Pacific State Hospital in Pomona, California were given roles in this film.
A contemporary article in Daily Variety noted that Burt Lancaster spent a week researching his role at the Pacific State Hospital in Ponoma, California, which closed in 2015.